There were no vampires of note in Western literature until about the 18th century. But they tell us where we park our anxieties, whether its over-powerful women, death or damnation. We make our own monsters.
As a medical doctor, it is my duty to evaluate the situation with as much data as I can gather and as much expertise as I have and as much experience as I have to determine whether or not the wish of the patient is medically justified.
Basically if you burst into my office the walls themselves will flutter as if alive - maybe that's the reason for all the wings in 'Pure.'